From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1P3dDj-00069h-Ix for garchives@archives.gentoo.org; Wed, 06 Oct 2010 23:16:23 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id A62A1E0B8D; Wed, 6 Oct 2010 23:16:12 +0000 (UTC) Received: from mail-wy0-f181.google.com (mail-wy0-f181.google.com [74.125.82.181]) by pigeon.gentoo.org (Postfix) with ESMTP id 66A4EE0B8D for ; Wed, 6 Oct 2010 23:16:12 +0000 (UTC) Received: by wya21 with SMTP id 21so116552wya.40 for ; Wed, 06 Oct 2010 16:16:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=3dQmIMSFtgnUS9ynwzxyj5rfIdqEHhEaqRNFIwASEbk=; b=FQ4FCIzHosixv5e+aY0WoZUnC53RAGk3Ny8mJSXow+h4ovasJEU0SOHR3CVrmFeIWc cz2mZqNY3YhkEx0PY49VJ/u25F58KI45Dsxzh2zA7Ppo28p/w4+mzO+GBMAMETJEteJB 8G8XTWCNiHe/zJqitPZv5dOsLQX9kBY0aUdUA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=ilveWRSd06EgyAJIt58FiHPypHb/5LfpK3SO4mwvqCTYvISQIVg1YusX4on5sZR24z M+VKuJCiGgY46SAHKbDWop3KTXT+OENGxoa4cfZSGH+vAvThEQoQu61OGqOjmda1LZw7 bDu1jLlUgA7A2vM8jgiEkPO2I8ucB7qasAs9k= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.227.69.134 with SMTP id z6mr11024760wbi.201.1286405948548; Wed, 06 Oct 2010 15:59:08 -0700 (PDT) Received: by 10.216.21.141 with HTTP; Wed, 6 Oct 2010 15:59:08 -0700 (PDT) In-Reply-To: <4CACC555.309@admin-box.com> References: <201009301853.28825.volkerarmin@googlemail.com> <4CA5A440.80601@admin-box.com> <4CA76BF0.8040800@admin-box.com> <4CACC555.309@admin-box.com> Date: Thu, 7 Oct 2010 09:59:08 +1100 Message-ID: Subject: Re: [gentoo-user] Re: Normal disk speed? From: Adam Carter To: gentoo-user@lists.gentoo.org Content-Type: multipart/alternative; boundary=00163645901899ad5d0491fab9f7 X-Archives-Salt: 7eff03c5-d46e-4dc1-9dfe-f8c98911a5bf X-Archives-Hash: ae4676e85094a941d440ec6a3f89e9d6 --00163645901899ad5d0491fab9f7 Content-Type: text/plain; charset=ISO-8859-1 WOW! Those differences are crazy! > > Please - I know benchmarking takes a lot of time - but could you check > something: the behavior those fs have at what time they flush data from > cache to disk is very different. Have you made sure that you measured > the time it really needs? I mean the difference between: > > $ sync; time cp source dest > and > $ sync; time (cp source dest; sync) > > Only the last measures somewhat correctly. > I had noticed that there was, say, 5 seconds of disk activity after the cp command complete which I assumed was buffers getting flushed, but 5 seconds didnt seem that significant overall. I will run the tests as you suggest and post back. Do you think btrfs (with or without compression) would be faster than reiser? If so I will try that as well. --00163645901899ad5d0491fab9f7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable WOW! Those differences are crazy!

Please - I know benchmarking takes a lot of time - but could you check
something: the behavior those fs have at what time they flush data from
cache to disk is very different. Have you made sure that you measured
the time it really needs? I mean the difference between:

$ sync; time cp source dest
and
$ sync; time (cp source dest; sync)

Only the last measures somewhat correctly.

I had = noticed that there was, say, 5 seconds of disk activity after the cp comman= d complete which I assumed was buffers getting flushed, but 5 seconds didnt= seem that significant overall. I will run the tests as you suggest and pos= t back. Do you think btrfs (with or without compression) would be faster th= an reiser? If so I will try that as well.
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